Volvo XC90: Driver Alert Control - DRIVER SUPPORTVolvo XC90: Driver Alert Control

The Driver Alert Control (DAC) function is designed to help alert the driver to erratic behavior, e.g. if the driver is distracted or showing signs of fatigue.

The objective of the function is to detect slowly deteriorating driving behavior and is primarily intended to be used on major roads.

The function is not intended for use in city traffic. DAC is activated when the vehicle's speed exceeds 65 km/h (40 mph) and remains active as long as speeds are above 60 km/h (37 mph).

Volvo XC90. Driver Alert Control

Driver Alert Control detects the vehicle's position in the traffic lane.

A camera monitors the traffic lane's marker lines and compares the direction of the road with the driver's movements of the steering wheel.

Volvo XC90. Driver Alert Control

The vehicle is moving erratically in the lane.

Volvo XC90. Driver Alert Control If driving behavior becomes considerably erratic, the driver will be alerted by this symbol in the instrument panel, an audible signal and the message Time for a break.

If the vehicle is equipped with Sensus Navigation* and the Rest Stop Guidance function is activated, suggestions will also be provided for suitable places to take a break.

The warning will be repeated after a short time if driving behavior does not improve.


Driver Alert Control must not be used to extend a period of driving. The driver should plan in breaks at regular intervals and make sure they are well rested.


An alarm from Driver Alert Control should be taken very seriously since a sleepy driver is often not aware of their own condition. If the alarm sounds or you feel fatigued:

  • Stop the vehicle safely as soon as possible and rest.

Studies have shown that it is just as dangerous to drive while tired as it is to drive under the influence of alcohol or other stimulants.


The function is supplementary driver support intended to facilitate driving and help make it safer – it cannot handle all situations in all traffic, weather and road conditions.

The driver is advised to read all sections in the Owner's Manual about this function to learn of its limitations, which the driver must be aware of before using the function.

Driver support functions are not a substitute for the driver's attention and judgment. The driver is always responsible for ensuring the vehicle is driven in a safe manner, at the appropriate speed, with an appropriate distance to other vehicles, and in accordance with current traffic rules and regulations.

* Option/accessory.

Activating or deactivating Driver Alert Control

The Driver Alert Control (DAC) function can be activated or deactivated.

  1. Tap Settings in the center display's Top view.
  2. Select My Car Volvo XC90. Driver Alert Control IntelliSafe Volvo XC90. Driver Alert Control Driver Alert.
  3. Select/deselect Alertness Warning to activate/deactivate the function.
BLIS messages
A number of messages related to BLIS1 may be displayed in the instrument panel. Several examples are provided below. A An authorized Volvo workshop is recommended. B Cross Traffic Alert* A text message ...

Selecting guidance to a rest area if the Driver Alert Control warning has been given
In vehicles equipped with Sensus Navigation*, the driver can activate a guide that can automatically suggest a suitable rest stop if the Driver Alert Control (DAC) warning is given. The Rest Stop Guidance ...

See also:

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Disconnecting Bluetooth-connected devices
Phones or other devices in the list of registered Bluetooth devices can be removed. Tap Settings in the Top view. Tap Communication Bluetooth Devices. A list of registered Bluetooth devices is displayed. ...

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